There are 8 US Post Offices in Wayne County serving a total of 14,979 residents equating to 1,872 residents per post office. It's estimated that approximately 23,908 packages are handled across the 8 county post offices annually. Wayne County is a county located in the U.S. state of Illinois. According to the 2010 census, it had a population of 16,760. Its county seat is Fairfield. It is located in the southern portion of Illinois known locally as \"Little Egypt\"."